database

[Muhasin]

is it possible to connect a database to c programm?

Yes, try OBDC.

[Muhasin]

i dont know how to connect it.can you help me?

[N1GHTS]

First you must pick a database. This is just a few, most of them are free:

PostgreSQL: http://www.postgresql.org/docs/8.4/static/libpq.html
MySQL: http://dev.mysql.com/doc/refman/5.0/en/c.html
Microsoft SQL: http://msdn.microsoft.com/en-us/library/aa936940%28v=sql.80%29.aspx
SQLite: http://www.sqlite.org/c_interface.html
Oracle: http://orclib.sourceforge.net/
ODBC (Any): http://www.easysoft.com/developer/languages/c/odbc_tutorial.html

Then you need to link your program to it. Pick your compiler and find out how to do it.

GCC: http://pages.cs.wisc.edu/~beechung/ref/gcc-intro.html
Microsoft C: http://msdn.microsoft.com/en-us/library/bb384838.aspx
Borland and others: http://www.tenouk.com/cncpluspluscompiler.html